Recent content by CaptKJB

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    Pentair Master Temp 300 - Short Cycling

    No, no error codes on the ignition control either. I do hear a slight rattle down line (by the chlorinator) which might indicate the broken by-pass valve piece.
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    Pentair Master Temp 300 - Short Cycling

    ajw22, Thanks for the reply. I appreciate it. If by-pass valve is the culprit, why am I not getting a HLS error? Just curious.
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    Pentair Master Temp 300 - Short Cycling

    3450 on the RPM Pentair Clean & Clear filter 33psi in spa mode, 25psi in pool mode I clean filter weekly...yesterday was last cleaning.
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    Pentair Master Temp 300 - Short Cycling

    My Master Temp 300 heater is short-cycling, but no error codes are given. Heater fires for 5 seconds and then off for about 30 seconds then repeats.....forever. Could it be a bad by-pass valve? I would think if it was a sensor( pressure, temp etc) it would throw an LED error on the back of...
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    Pool/Spa Heater (cycling on and off every 45 seconds). Takes 1.5 hours to heat spa

    I'm having same issue with my heater. Did changing the by-pass valve fix the short-cycling? Will a bad by-pass valve not show any error codes?
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    Pentair Master Temp 300 - Short Cycling

    I recently purchased a home with a heated pool & spa. The heater worked fine for a few months, but it's been taking longer and longer to heat the spa. Recently took over 2 hours to go 10 degrees. (84 to 94). When I put the pool in"spa" mode, the blower comes on, the amber heater blinks...
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